2620A/2625A
Users Manual
Hydra Series II Data Acquisition Unit Hydra Series II Data Logger
LIMITED WARRANTY & LIMITATION OF LIABILITY
5/94
Introduction
Table of Contents
Title
Overview
Using the Computer Interface
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Operating the Instrument from the Front Panel
Using Shielded Wiring
Using the IEEE-488 Interface
Computer Interface Command Set
Additional Considerations
Appendices
Maintenance
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Index
List of Tables
Title
Performance Tests Voltage, Resistance, and Frequency
Performance Tests for RTD Temperature Function DIN/IEC 751 Amendment
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Amendment 1 IPTS-68
4-Terminal Connections to Decade Resistance Box
List of Figures
Title
Hydra DB-9 to PC DB-9 RS-232 Connection Generic
Bescheinigung des Herstellers/Importeurs
Interference Information
Declaration of the Manufacturer or Importer
viii
To avoid electric shock
Safety Terms in this Manual
Symbols Marked on Equipment
∙ Remove inputs from live voltages before opening the input module
Use the Proper Power Cord
AC Power Source
DC Power Source
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Introduction
Getting Started
Setting Up a Channel
The Basics
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Selecting the Scan Data Destination
Taking Measurements
Getting Started continued
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Press Mto activate the Monitor function
Viewing Minimum, Maximum, and Last Data Values
LAST MIN MAX LAST MIN MAX
oo24f.eps
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Users Manual
Title
Introduction
Chapter
Page
2620A, 2625A
Users Manual
The Hydra Series II Data Logger
Options and Accessories
The Hydra Series II Data Acquisition Unit
IEEE-488 Interface Assembly
Table 1-1. Hydra Features
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Where to go From Here
Where to go From Here
Accessories
Introduction
Getting Started
Chapter 4 Using the Computer Interface
Chapter 6 Maintenance
Chapter 1 Introduction
Overview
Chapter
Title
2620A, 2625A
Users Manual
Adjusting the Handle
Setting Up the Instrument
Introduction
Unpacking and Inspecting the Instrument
Line Power
Front/Rear Panel Features
Setting Up the Instrument
Overview
Figure 2-2. Front Panel
Figure 2-3. Left Display
Figure 2-4. Right Display
Figure 2-5. Annunciators
Setting Up the Instrument
Overview
Table 2-1. Display Annunciators
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Table 2-1. Display Annunciators cont
Figure 2-6. Rear View
Operating Modes
Turning the Instrument On
Input Channels
Left Display
Front Panel Display
Reading the Display
Right Display
Front Panel Buttons
Using the Buttons
Selecting a Channel
Setting up a Channel
N O L K
Setting up a Channel
Setting Alarm Limits and Mx+B Scaling Values
Alarm Limits
Setting the Scan Interval
Mx+B Scaling
Using the Monitor Function
Using the Scan Function
Reviewing Channel Data
Using External DC Power
Viewing the Totalizer Count
Using the Rack Mount Kit
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Changing the Temperature Unit
Operating the Instrument from the Front Panel
Using the Digital I/O Lines
Setting Date and Time of Day
Front Panel Monitor Only Function
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Front Panel Review Only Function
Computer Interface-Initiated Lockouts
Introduction
Configuration Mode
Figure 3-1. Configuration Mode
Operating Modes
Other Displayed Data
What is the Present Configuration?
Channel Configuration
If Power is Interrupted
Table 3-1. Configuration Reset Settings
Channels 4-20 assigned to digital I/O lines 4-7, as follows
cleared for all channels
Page
Channel Configuration
Operating the Instrument from the Front Panel
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Channel Configuration
Setting Alarms
Alarm Limits
Operating the Instrument from the Front Panel
Alarm Indications
GAGE
Resetting Alarm Conditions
Using the Digital I/O Lines
Table 3-8. Initial Alarm Assignments, Digital I/O Lines 4 Through
Mx+B Scaling
B to define the scaling values
Page
Instrument Configuration
Entering and Changing Numeric Values
Selecting Scan Interval
Selecting the Measurement Rate
External Triggering
Changing the Temperature Unit
Triggering
Table 3-11. Measurement Rate Selection
To avoid electric shock
Measurement Connections
Setting Date and Time of Day
∙ Remove inputs from live voltages before opening the input module
DC Volts, AC Volts, Frequency, and Thermocouples
STRAIN RELIEF
Operating the Instrument from the Front Panel
Measurement Connections
Figure 3-2. Input Module Connections
Resistance and RTD
Operating the Instrument from the Front Panel
Measurement Connections
USE H AND L TERMINALS FOR ANY CHANNEL CHANNEL 0 ON FRONT PANEL
General
Totalizing
Review Array
Connections
List Button Functions
Table 3-16. List Button Operation
Note1
Autoprint
Memory Storage
Front Panel Lock out Conditions
Front Panel Review Only Function
Front Panel Monitor Only Function
REM Annunciator
Calibration
Computer Interface-Initiated Lockouts
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Users Manual
Chapter
Using the Computer Interface
Installing the IEEE-488 Interface
Title
Status Byte Register
Service Request Enable Register
Computer Interface Command Set
4-19
L. If IEEE appears on the display, the IEEE-488 interface is enabled
Using the RS-232 Computer Interface
To determine which computer interface is enabled, select COMM K
Otherwise, if a baud rate appears, the RS-232 interface is enabled
Setting Communication Parameters RS-232
Autoprint and Memory Storage RS-232
Autoprint Computer Interface Control
Autoprint Output Format
07420102/09/91
Memory Storage Computer Interface Control
Memory Retrieval
5 -3.2345 mMX+B H/R12123.87 kOHMS/L1731.268VAC ALM15DIO204TOTAL0
Memory Full Operation
Clearing Memory
Cabling the Instrument to a Host or Printer RS-232
RS-232 Information
Installation Test
Device Clear Using Ctrl C
Character Echoing
Installing the IEEE-488 Interface
Using the IEEE-488 Interface
Sample Program Using the RS-232 Computer Interface
RS-232 Prompts
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Figure 4-2. Sample Program
Using the Computer Interface
Using the IEEE-488 Interface
Figure 4-2. Sample Program cont
Capability
Table 4-3. IEEE-488 Setup BaudAddress
Enabling the IEEE-488 Interface
Table 4-2. IEEE-488.1 Capabilities Description
General Information RS-232 and IEEE-488
Installation Test
How the Instrument Processes Input
Input Terminators
Input Strings
The instrument stores received input in a 350-byte input buffer
Typical Input Strings
FUNC 1, OHMS, 3
Using the Computer Interface
General Information RS-232 and IEEE-488
FUNC 12, TEMP, K
Sending Numeric Values to the Instrument RS-232 and IEEE-488
Sending Input Strings to the Instrument
How the Instrument Processes Output
Service Requests IEEE-488 only and Status Registers
7 6 ESB
Output Queue
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Name
Event Status and Event Status Enable Registers
Status Byte Register
Table 4-4. Status Byte Register Description
Reading the Status Byte Register
Service Request Enable Register
Instrument Event Register
Computer Interface Command Set
Using the Computer Interface
Computer Interface Command Set
Table 4-7. Command and Query Summary
Table 4-7. Command and Query Summary cont
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Using the Computer Interface
Computer Interface Command Set
Table 4-7. Command and Query Summary cont
Table 4-8. Command and Query Reference
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Using the Computer Interface
Computer Interface Command Set
Table 4-8. Command and Query Reference cont
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limitnum =
Using the Computer Interface
Computer Interface Command Set
DOstate
Return alarm limit data for specified channel and limit
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Set instrument calendar values
Using the Computer Interface
Computer Interface Command Set
Table 4-8. Command and Query Reference cont
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Using the Computer Interface
Computer Interface Command Set
If the channel indicated is invalid, an Execution Error is generated. For valid channels, two or three comma-separated data fields are returned. One of the following function definitions is returned in the first data field
Table 4-8. Command and Query Reference cont
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Using the Computer Interface
Computer Interface Command Set
LOCK LOCK? LOCS LOG?
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LOGGED? LOGBIN? LOGCLR LOGCOUNT?
Using the Computer Interface
Computer Interface Command Set
Table 4-8. Command and Query Reference cont
Table 4-8. Command and Query Reference cont
Enables monitoring of given channel if monitoring
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Using the Computer Interface
Computer Interface Command Set
Next Scan’s Values
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Using the Computer Interface
Computer Interface Command Set
Table 4-8. Command and Query Reference cont
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Using the Computer Interface
Computer Interface Command Set
Table 4-8. Command and Query Reference cont
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Using the Computer Interface
Computer Interface Command Set
TOTAL TOTAL? TOTALDBNC TOTALDBNC? TRIGGER
TRIGGER?
alarm
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Trigger Type Query
Monitor Alarm Enabled Type
Additional Considerations
External Trigger Enabled Type
When Measuring Resistance or Temperature RTD
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Users Manual
Introduction
Measurement Rate
Advanced Trigger Mechanisms
These two additional trigger mechanisms are mutually exclusive
Both External and Monitor Alarms Disabled Type
External Trigger Enabled Type
REMS, a *TRG can be generated from the front panel by pressing Q
Additional Considerations
Advanced Trigger Mechanisms
When Measuring Resistance or Temperature RTD
Thermal Voltages
Monitor Alarm Enabled Type
When Measuring Resistance or Temperature Rtd
Additional Considerations
oo16f.eps
True RMS Measurements
Effects of Internal Noise in AC Measurements
Waveform Comparison True RMS vs Average Responding
Making Mixed Measurements
Making Mixed Measurements
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Figure 5-3. Comparison of Common Waveforms
TO DISPLAY RMS FOR SINE WAVES
Isolated and Shielded Sensor Configuration
Using Shielded Wiring
Non-Isolated Sensor Configuration
WWarning
In More Detail
Dedicated Alarm Output Test
Maintenance
Thermocouple Temperature Accuracy Test
Chapter
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Users Manual
Line Fuse
Cleaning
Self-Test Diagnostics and Error Codes
When the instrument is powered up, the entire display lights
Performance Tests
Table 6-1. Power-Up Error Codes Description
Maintenance
Error
Performance Tests
Instrument Type
Table 6-2. Recommended Test Equipment Minimum Specification
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Recommended Model
Accuracy Verification Test
Channel Integrity Test
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20 mV
Thermocouple Measurement Range Accuracy Test
Table 6-3. Performance Tests Voltage, Resistance, and Frequency cont
4-Terminal Resistance Test
Thermocouple Temperature Accuracy Test
EX GRD
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EX SNS
OUTPUT
HYDRA INPUT MODULE
Open Thermocouple Response Test
DECADE RESISTANCE BOX
J K N E T
RTD Temperature Accuracy Test
RTD Temperature Accuracy Test Using Decade Resistance Source
RTD Temperature Accuracy Test Using DIN/IEC
Digital Input/Output Verification Tests
Digital Output Test
DOLEVEL 0,0 CR Assure output 0 measures a LOW state. DOLEVEL 1,0 CR
Digital Input Test
Table 6-7. Digital Input Values STATE OF DIGITAL INPUTS
Totalizer Test
TERMINAL GROUNDED
DECIMAL VALUE
Totalizer Sensitivity Test
Dedicated Alarm Output Test
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V ΩA
Calibration
External Trigger Input Test
Calibration
Service
Variations in the Display
Appendices
Appendix
Title
Page
Accuracies at Ambient Temperatures Other Than Specified
Specifications
Appendix A
Introduction
Common Mode Rejection
DC Voltage Inputs
Normal Mode Rejection
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Thermocouple Inputs
Appendices
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Appendices
RTD Inputs
Common Mode and Normal Mode Rejection
Input Impedance
Maximum Sensor Temperature
AC Voltage Inputs
2-Wire Accuracy
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Appendices
DC Component Error
Crest Factor Error
Common Mode Rejection
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Appendices
Ohms Inputs
2-Wire Accuracy
Input Protection
Frequency Range
Frequency Inputs
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Sensitivity
Typical Scanning Rate
Appendices
A-11
Digital Inputs
Maximum Autoranging Time
Totalizing Input
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Isolation
Trigger Input
Appendices
Threshold
Environmental
Digital and Alarm Outputs
Real-Time Clock and Calendar
Battery Life
Weight
General
Common Mode Voltage
Appendices
Power
2625A Data Storage
2620A Options
2620A/2625A
ASCII & IEEE-488 Bus Codes
Appendix B
ASCII & BUS CODES
Implementation of IEEE Standard
IEEE-488.2 Devise Documentation Requirements
Appendix C
The initial power-up device setting is Channels 0 - 20OFF
Digital I/O lines high non-alarm Totalizer 0, with debounce disabled
Alarm parameters Limit-1 and Limit-2 OFF. All limit values
Alarm assignments Channels 0-3 assigned to outputs 0-3,respectively
Open Thermocouple Detection OTC enabled
Appendices
COMMAND MESSAGE UNIT QUERY MESSAGE UNIT COMMAND PROGRAM HEADER
The following queries return data in two formats ALARMLIMIT?
PROGRAM MESSAGE UNIT PROGRAM MESSAGE UNIT SEPARATOR
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The *CAL? command not implemented an optional command
The *RDT and *RDT? commands are not implemented
There are no device-to-device messages
Operation complete is generated when the command is parsed
Appendices
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Appendix D
Signal Cross Talk in a DC Voltage Channel
Making Mixed Measurements
Introduction
AC Signal Cross Talk Into a Frequency Channel
AC Signal Cross Talk Into an AC Voltage Channel
AC Signal Cross Talk Into an Ohms Channel
Ratio worst case
5.0 ×
AC Signal Crosstalk Into a Temperature Channel
TEMPERATURE Error Ratio = ⎢
2.0 ×
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Decoding the ASCII String
Binary Upload of Logged Data LOGBIN? 2625A only
Appendix E
Introduction
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Figure E-1. ASCII String Decoding
Floating Point Conversion
Appendices
Example
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Appendices
Figure E-2. Floating Point Conversion
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Figure E-3. Example
Connections
RS-232 Cabling
Appendix F
Cables
PRINTER
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RS43
PRINTER
RS43 CABLE NULL MODEM
RTS - REQUEST TO SEND CTS - CLEAR TO SEND RI - RING INDICATOR
Appendices
DCD Rx Tx DTR GND DSR RTS CTS RI
RS40 CABLE OR EQUAL
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Rx Tx DTR GND DSR RTS CTS
Tx Rx RTS CTS DSR GND DCD
Appendices
Figure F-4. Hydra DB-9 to Modem DB-25 RS-232 Connection
RS42 CABLE OR EQUAL
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Rx Tx DTR GND DSR RTS CTS
Tx Rx RTS CTS DSR GND DCD
Figure F-6. RS-232 DB9 and DB-25 Connectors
Appendices
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Hydra Configuration Record
Index
